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  Holden HG Monaro 1970

 


HG Monaro
The HG Monaro GTS 350 was rated by many as being the best of this shape Monaro even though it's suspension and engine were de-tuned for comfort as opposed to handling. Now that the Torana was being used by Holden for most of its racing the Monaro was sweetened for comfort which included softer springs and a 2-speed Powerglide for the GTS 350.  The auto helped make the car feel like a luxury car as the 275 bhp, (300bhp in the manual), was smoothed out by an excellent auto.  People had been a little apprehensive about the clunkeness of the 4-speed so this was a good alternative for those who wanted a smooth changing car that could still do a 16 second quarter mile without having to heavy hand a gear lever.  Around the towns of Australia the changes to the handling set-up was noticeable as was the slightly heavy brake peddle from the heavy duty linings.  The auto GTS also catered for the business executive Brougham driver who really wanted a coupe instead to take his girlfriend (secretary) out of town for that late night dictation in a remote roadside motel.  The reclining seats were a new novelty that gave the exec the choice to pull up under the shade a willow and have a rest after a long night of dictation.  Even in the 1970's the seat was an integral part of absorbing the bumps and the seat worked well with the new spring rates to give comfort over the roughest of streets.  The 2-speed powerglide is ideal for overtaking at highway speeds as first gear is good for 75 mph and it could get from 50 mph to 70 mph in under 3.5 seconds and with the power steering made for easy travelling.  The 4-speed GTS 350 was still a bit of a brute and for those who wanted the ultimate the an Australian car could give them then this was the pick of the bunch.


DATE OF INTRODUCTION
July 1970

NUMBER BUILT
6,147

MODELS
Monaro Coupe
Monaro GTS
Monaro GTS 350

PRICES AT RELEASE
Monaro (161 ci six & 3 speed manual) - $2765,
Monaro GTS (186 ci six & 4 speed manual) - $3323,
Monaro GTS 350 (5.7 V8 & 4 speed manual) - $4174

TRANSMISSIONS
Three-speed manual. (Synchro in 2nd & 3rd)
Three-speed manual. (All synchro. Column shift), 253 and six cylinder engines
Four-speed all synchro manual.
M21 four-speed all synchro manual.
Two speed Powerglide automatic
Three speed Trimatic automatic
 

ENGINE/TRANSMISSION COMBINATIONS
161 engine standard on Monaro, 186, 186S, 253 and 308 optional.
186S standard on Monaro GTS, 253 and 308 optional.
Three speed column shift manual standard on Monaro, Trimatic automatic optional.
Four speed floor shift manual standard on Monaro GTS, optional with floor shift only.
Four speed heavy duty manual standard on GTS 350, Powerglide with floor shift optional

BRAKES
Front:Drums are standard with six cylinder models, power assistance optional.
Power assisted discs standard on Monaro GTS and V8s.
Front 10.5 inch (268 mm) discs
Rear 10 inch (254 mm) drums

WHEELS
Monaro and Monaro GTS - 5.00JJx14
V8 GTS - 6.00JJx14

INSTRUMENTS/CONTROLS
Monaro - Speedo, fuel gauge, water temperature, oil pressure and generator charge warning lights.
GTS - Speedo, tacho, fuel gauge, oil pressure, ammeter, generator charge warning light, water temperature gauge, handbrake warning light.

EXTERIOR DIMENSIONS
Total length (inches/mm):184.8 inches (4527.6 mm)
Total width (inches/mm):71.8 inches (1759.1 mm)
Wheelbase (inches/mm):111 inches (2719.5 mm)

KERB WEIGHT
Monaro 161 - 2897 lbs (1315.3 kg).
GTS 186S - 2947 lbs (1337.9 kg) lbs
GTS 350 - 3386 lbs (1530 kg)

TURNING CIRCLE
36.5 ft (10.7 m).

FUEL TANK CAPACITY
All models except GTS 350 - 16.5 gallons (75 litres)
GTS 350 - 25 gallons (113.7 litres)

ENGINE NUMBERS
Located stamped on a pad at the front of the right hand cylinder bank.
The prefixes for the HG GTS 350 Monaro automatic is '327A' and the manual '350M'. The engine serial number follows.

BODY/CHASSIS NUMBERS
Located stamped on a plate attached to the right hand side of the firewall. The first five numbers of the 13 digits is the model number.
80337 - Monaro Coupe
80437 - Monaro Coupe
80837 - Monaro GTS Coupe
81837 - Monaro GTS 350 Coupe

 The next letter is the series code
G for HG Monaro

The next two digits are a letter/number combination indicating the plant at which the vehicle was built
H1-H4 - Brisbane
H5-H9 - Sydney
J1-J9 - Melbourne
L1-L5 - Adelaide
L6-L9 - Perth

The remaining five numbers is the vehicle serial number represent the sequence in which the vehicle was built at that particular plant.

OTHER IDENTIFICATION MARKS
GTS 350 - 'GTS' and 'Monaro' badges.
Headlight bezels, grille, under front and rear bumpers, along sill panels, bonnet scoops and rear of boot lid blacked out.
Four slanted vertical louvres in lower front guards.
Low profile bonnet scoops both sides of  bonnet.

 Specifications
161ci (low compression engine)
Capacity 161 ci (2640 cc)
OHV six cylinder inline, front engined, rear wheel drive
One barrel downdraught Bendix Stromberg carburettor
Bore and stroke 3.375 inches (85.7 mm) (85.7 mm) x 3.00 inches (76.2 mm)
Power output 108 bhp (80.6 kW) at 4400 rpm
Torque 146 lb/ft (197 Nm) at 2000 rpm
Compression ratio:8.2:1

161ci (high compression engine)
Capacity 161 ci (2640 cc)
OHV six cylinder inline, front engined, rear wheel drive
One barrel downdraught Bendix Stromberg carburettor
Bore and stroke 3.375 inches (85.7 mm) (85.7 mm) x 3.00 inches (76.2 mm)
Power output 114 bhp (85 kW) at 4400 rpm
Torque 157 lb/ft (211.9 Nm) at 2000 rpm
Compression ratio:9.2:1

186 ci (3050 cc)
Capacity:186 ci (3050 cc)
OHV six cylinder inline, front engined, rear wheel drive
One barrel downdraught Bendix Stromberg carburettor
Bore and stroke:3.625 inches (88.8 mm) inches x 3.00 inches (76.2 mm)
Power output 130 bhp (97 kW) at 4400 rpm
Torque 181 lb/ft (244.3 Nm) at 2000 rpm
Compression ratio:9.2:1

186S (3050 cc)
OHV six cylinder inline, front engined, rear wheel drive
One barrel downdraught Bendix Stromberg carburettor
Bore and stroke:3.625 inches (88.8 mm) inches x 3.00 inches (76.2 mm)
Power output 145 bhp (108.2 kW) at 4600 rpm
Torque 184 lb/ft (248.4 Nm) at 2200 rpm
Compression ratio:9.2:1

253 V8 (4149 cc)
Capacity 253 ci (4149 cc)
OHV V8, rear wheel drive, rear wheel drive
Single two barrel Bendix Stromberg WW downdraught carburettor
Bore and stroke:92.08 mm x 77.77 mm
Power output 185 bhp (138 kW) at 4400 rpm
Torque 262 lb/ft (353.7 Nm) at 2400
Compression ratio:9:1

308 ci (5047 cc)
OHV V8, rear wheel drive, rear wheel drive
Single four barrel Rochester Quadrajet downdraught carburettor
Bore and stroke:4.0 inches (101.6 mm) x 3.062 inches (75.0 mm)
Power output 240 bhp (179.0 kW) at 4800 rpm
Torque 315 bhp (434 Nm) at 3000 rpm
Compression ratio 9.0:1

350 ci (5740 cc  manual transmission)
OHV V8, rear wheel drive, rear wheel drive
Single four barrel Rochester Quadrajet downdraught carburettor
Bore and stroke:4.0 inches (101.6 mm)x 3.480 inches (85.26 mm)
Power output 300 bhp (223.8 kW) at 4800 rpm
Torque 380 lb/ft (513 Nm) at 3200 rpm
Compression ratio:10.25:1

350 ci (5740 cc  automatic transmission)
OHV V8, rear wheel drive, rear wheel drive
Single four barrel Rochester Quadrajet downdraught carburettor
Bore and stroke:4.0 inches (101.6 mm)x 3.480 inches (85.26 mm)
Four barrel Rochester Quadrajet downdraught carburettor
Power output 275 bhp (205.1 kW) at 4800 rpm
Torque 365 lb/ft (492 Nm) at 3200 rpm
Compression ratio:9.0:1

 Pics

Some of these pics have been used with the permission from
http://autopics.com.au